SP in sims 3 is Nraas Story Progression mod. It lets your townies have lives, get married, have kids, change jobs and whatnot. I have been playing without it lately and I actually have enjoyed it, but only because the mod is a big performance hit on the game and causes lag.

Thanks for reading! Yes, I definitely had a hard time keeping their names straight. I really, really need to get back to this soon. I have been on an extended Sims break, but I should be returning shortly.